Materials Literature
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Polyrotaxanes, in which different numbers of β-cyclodextrins (β-CDs) were threaded on the triblock copolymer of poly(ethylene glycol) (PEG) and poly(propylene glycol) (PPG) capped with fluorescein-4-isothiocyanate (FITC), were prepared, and their solution properties under alkaline conditions were characterized in term…
A high-pressure high-temperature diamond based sensor has been developed for the use in diamond anvil cells. The electronic structure of the sensor is that of p–i–p unipolar diode with boron doped p-type regions separated by an i-region containing compensated boron acceptors. The sensor has been fabricated by high-tem…
Micromachined high aspect ratio field emitter areas have been realized to obtain stabile and uniform emission current. Dry etching based on gas chopping method was used to etch the 42-μm-high ultra-sharp emitter tips in single-crystal silicon. Diamond-like carbon (DLC) films of 25–100 nm thickness were deposited from…
Cholesteric liquid crystals (CLCs) may selectively reflect light when the helicoidal pitch is of the order of the wavelength of the incident beam propagating along the helix axis. The reflection bandwidth is dependent on the birefringence and is limited to a few tens of nanometers, which is insufficient for applicatio…
The deposition of pure ruthenium thin films is reported from carbonyl β-diketonate precursors Ru(CO)2-(CH(C(O)R)2)2 (see Figure), where R = C(CH3)3 or CF3. The complexes are found to be excellent CVD precursors and the deposited films are reported to be fluorine free, which is one of the requirements for metallization…
It is well known that amorphous carbon and related films consist of nano-sized carbon clusters. With the incorporation of hydrogen into these films, the hydrogen termination limits the cluster size and decreases the bond strength among clusters. In this study, dehydrogenation from amorphous hydrogenated carbon nitride…
The electronic structure of graphitic cones is investigated within the self-consistent field-theory model. The local and total density of states near the apex are found for cones of different opening angles. For extended electronic states, the total density of states is found to vanish at the Fermi level at any openin…
The hydrogen-bonded liquid crystalline complexes of 4-n-alkoxycinnamic acids (nCNA: n=4-8, 10, 12, 16, 18, where n is the number of carbons in the alkoxy chain) with 4,4'-bipyridine (BPy) have been prepared and characterized. The existence of smectic C, smectic A, and nematic mesophases of these complexes was demonstr…
Polypropylene (PP) based conductive composites were produced using stainless steel fibres (SSF) as the fillers. Their mechanical properties, electrical conductivity and electromagnetic interference (EMI) shielding effectiveness were measured. For the purposes of performance optimization, polypropylene grafted maleic a…
To gain insight into the effects of intermolecular H-bond association on the changes in permittivity and relaxation characteristics of supercooled alcohols, two techniques were used here: (i) introducing a C 6 H 5 group in 2-propanol to obtain 1-phenyl-2-propanol, and thus increasing the steric hindrance to H-bonding,…
Experiments on foam drainage have so far only been performed in essentially one-dimensional flow geometries aligned with the direction of gravity. Here a foam-filled Hele-Shaw cell is used to examine pulsed drainage, which is the flow of a finite liquid volume, both along and perpendicular to the direction of gravity.…
Small amounts of 1,7-octadiene (OD) comonomer, ranging from 0.5–5.0 mol-%, were added during propene polymerization, catalyzed with methylalumoxane (MAO) activated rac-Me2Si(2-Me-4-phenyl-Ind)2ZrCl2 (MPI), in order to incorporate long chain branches and small amounts of high molecular mass polypropene (PP), thus impro…
A novel method for large-scale preparation of yttria-stabilized zirconia (YSZ) nanocrystals is presented. The hydrous YSZ colloidal nanoparticles are self-assembled on the surface of SrCO 3 nanoparticles by a sonochemical method. After calcination, fully crystalline monodispersed YSZ nanoparticles are obtained, and th…
Efficient energy transfer in polymer blends, comprising a fluorene-based liquid-crystalline polymer (see Figure) and a non-liquid-crystalline photoluminescent polymer, is demonstrated. Low-threshold amplified spontaneous emission, originating from the efficient Förster-type energy transfer between the host and the gue…
We describe an alternating current method for the measurement of the longitudinal (Sxx) and transverse (Sxy, i.e., Nernst) thermopower of millimeter-size crystal samples at low temperatures (T<1 K) and high magnetic fields (B∼30 T). A low-frequency (33 mHz) heating method is used to increase the resolution and…
Abstract The reduction process of Cu–ZSM-5 was investigated by a time-resolved energy-dispersive XAFS (DXAFS) technique. The spectra were recorded every second and the entire spectra were analyzed to elucidate the dynamic change of the local structure around the Cu species. Two Cu–ZSM-5 samples with different Cu loadi…
Multilayer ultrathin films were obtained from phenolic shell-modified PAMAM dendrimers (G3.0) and diazo resin (DR) as building blocks via hydrogen bonding attraction using the deposition technique. Under UV irradiation, the nature of the linkage between layers converted from H-bonding to covalent, which increased the…
Polymers have been widely used for the protection of metals against corrosion and for improving the performance of structural adhesive joints. In this contribution, the weakness and short-term durability of these polymer−metal interactions and some common approaches for alleviating this problem are briefly reviewed. A…
The initiation of sporulation in Bacillus subtilis results primarily from phosphoryl group input into the phosphorelay by histidine kinases, the major kinase being kinase A. Kinase A is active as a homodimer, the protomer of which consists of an approximately 400-amino-acid N-terminal putative signal-sensing region an…
Degenerate epitaxial crystallization of a semicrystalline block terpolymer is utilized to alter the polymer's normal microdomain structure. It is demonstrated that the strong interaction created by crystallographic matching of unit cells between the crystalline polyethylene (PE) block and the anthracene substrate forc…